21354441 has 16 divisors (see below), whose sum is σ = 29154048. Its totient is φ = 13899600.

The previous prime is 21354433. The next prime is 21354449. The reversal of 21354441 is 14445312.

It is an interprime number because it is at equal distance from previous prime (21354433) and next prime (21354449).

It is not a de Polignac number, because 21354441 - 2³ = 21354433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21354449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25926 + ... + 26736.

It is an arithmetic number, because the mean of its divisors is an integer number (1822128).

Almost surely, 2^21354441 is an apocalyptic number.

It is an amenable number.

21354441 is a deficient number, since it is larger than the sum of its proper divisors (7799607).

21354441 is a wasteful number, since it uses less digits than its factorization.

21354441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012.

The product of its digits is 1920, while the sum is 24.

The square root of 21354441 is about 4621.0865605396. The cubic root of 21354441 is about 277.4359498309.

Adding to 21354441 its reverse (14445312), we get a palindrome (35799753).

The spelling of 21354441 in words is "twenty-one million, three hundred fifty-four thousand, four hundred forty-one".